AI Research Engineer

PostHog Enterprise; Greater London; Hybrid; GBP 202,246 - 220,972; Full time

Benefits offered by this job

Unlimited vacation

Co-working credit

Private health, dental, and vision insurance

Pension & 401k contributions

Company offsites

Job summary

PostHog Enterprise in Greater London is seeking an AI Research Engineer to join their self-driving product initiative. You will work on large datasets, develop models, and ensure production-ready solutions.

Your role involves researching techniques to improve user behavior predictions, session replay analyses, and more. The ideal candidate has strong coding skills in Rust, a solid mathematics background, and a product-oriented approach. The position supports a hybrid work environment.

Qualifications

• Strong coding ability in Rust, CUDA, or C.
• Experience with deep learning models and mathematical concepts.
• Product mindset for building production-ready solutions.

Responsibilities

• Research emerging techniques and integrate them into production.
• Improve detection of issues in session replays using efficient models.
• Identify user behavior patterns to enhance conversion rates.
• Simulate users to detect confusing flows before product release.

Skills

Strong coding ability in Rust

Experience training models

Strong background in mathematics

Solid understanding of transformer architectures

Education

PhD in relevant field

Job description

Product development used to mean manually writing code, running analysis, diagnosing bugs, and rolling out changes using dozens of tools.

PostHog is the only platform that acts like a co-pilot for you (and your AI agents) to do it all – autonomously.

PostHog Code, the only AI devtool that understands your product, not just your codebase.

PostHog AI, an AI-powered analyst that answers product questions, helps users find useful session recordings, and writes custom SQL queries.

Who we're looking for

PostHog is working on a self-driving product and is training its own Deep ML models. This new AI Research team needs an AI Research Engineer who can work with our large data set, develop models, and ship production‑ready solutions.

What you'll be doing

You will be part of a team that researches emerging techniques and brings them into production. Your focus areas include:

• Session replay analysis – improving detection of issues in replays with scalable, efficient models.
• User behavior prediction – identifying drop‑offs, suggesting improvements, and boosting conversion rates automatically.
• Synthetic user testing – simulating users to catch confusing flows or breakages before release.

Job Requirements

• PhD is a plus; a strong background in mathematics is required.
• Alternatively, experience training models with strong math skills.
• Strong coding ability in Rust (preferred), CUDA, or C.
• Solid understanding of transformer architectures.
• A product mindset; you’ll build production‑ready products.
• Hybrid Remote with the London Office.

What we’re not looking for

• Pure theoretical expertise – this is not a Jupyter notebook job.
• Someone who only wants to research and publish; shipping has priority.

EEO & Accessibility

If you have a disability, please let us know if there's any way we can make the interview process better for you.

Compensation & Benefits

We have a transparent compensation system.

• Benchmark (United States - San Francisco, California) $285,000
• Step modifier 0.95 - 1.04

• Generous, transparent compensation & equity
• Unlimited vacation (with a minimum)
• Two meeting‑free days per week
• Home office
• Coworking credit
• Private health, dental, and vision insurance.
• Access to our Hedge House
• Carbon offsetting
• Pension & 401k contributions
• We hire and pay locally
• Company offsites